Product Description
Extreme Duty Allison Performance with ATS Stage 4 Power
The ATS 309-999-4308 LCT1000 6-Speed Stage 4 Package is a complete high-performance transmission upgrade engineered for 2006–2007 GM 4WD trucks equipped with the 8.1L engine. Designed to handle extreme torque, heavy towing, and high horsepower applications, this Stage 4 package transforms your Allison transmission into a serious performance and reliability machine.
ATS Stage 4 packages are built for truck owners who demand maximum durability and performance. This package includes upgraded internal components, improved clutch capacity, and performance calibration designed to eliminate slip, improve shift quality, and handle significantly increased power levels.
Whether you're towing heavy loads, running added horsepower, or building a competition-ready setup, this ATS package delivers unmatched strength and reliability.
Key Features:
- Complete Stage 4 performance transmission package
- Designed for extreme horsepower and torque capacity
- Upgraded clutch packs and internal components
- Improved shift firmness and transmission response
- Ideal for towing, performance, and heavy-duty applications
- Built on the proven Allison LCT1000 platform
- Engineered by ATS Diesel Performance
FAQ
What is included in a Stage 4 package?
Stage 4 packages typically include upgraded internal transmission components, clutch packs, and performance enhancements designed for maximum durability and power handling.
Is this suitable for high horsepower builds?
Yes, this package is specifically designed to handle high horsepower and extreme torque applications.
Will this improve towing performance?
Absolutely. The upgraded components improve holding power and reduce slippage under heavy loads.
Is professional installation required?
Yes, this is a complete transmission upgrade and should be installed by a qualified professional.
Fitment:
- 2006–2007 Chevrolet Silverado 2500HD / 3500
- 2006–2007 GMC Sierra 2500HD / 3500
- 8.1L Gas Engine
- 4WD Models Only
- Allison LCT1000 6-Speed Transmission
Note: Always verify fitment based on your exact vehicle configuration.
Specifications for ATS 309-999-4308
| ATS 309-999-4308 Product Specifications | |
|---|---|
| Part Number | 309-999-4308 |
| Brand | ATS Diesel Performance |
| Product Type | LCT1000 Stage 4 Transmission Package |
| Transmission Compatibility | Allison LCT1000 6-Speed |
| Engine Compatibility | 8.1L Gas Engine |
| Drivetrain | 4WD |
| Vehicle Fitment | 2006–2007 Silverado / Sierra 2500HD / 3500 |
| UPC | N/A |
| GTIN | N/A |
| Shipping Weight | Approx. 300 lbs |
| Shipping Method | Freight Shipping Required |
| Core Charge | Yes – Refundable Core Required |
| California Prop 65 | WARNING: Cancer & Reproductive Harm - www.P65Warnings.ca.gov |
